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A microscopic approach to finite-size effects in sintered metallic powders

A microscopic approach to finite-size effects in sintered metallic powders A microscopic theory is developed of finite-size effects in sintered metallic powders. In particular a model is constructed for the low frequency vibrational modes. It is argued that the bonding between atoms on adjacent surfaces of neighboring grains is extremely weak, 10−3–10−4 of its bulk value. Choosing the physical parameters accordingly, a constant density of “shaking box” states can be obtained. However, this behavior is not universal. A more complex density of states arises from slightly different choices of physical parameters and leads to a variety of temperature dependences for the sinter/liquid He Kapitza conductance at ultralow temperatures. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Low Temperature Physics Springer Journals

A microscopic approach to finite-size effects in sintered metallic powders

Lambert, C.
Journal of Low Temperature Physics , Volume 59 (2) – Nov 6, 2004
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References (16)

Publisher
Springer Journals
Copyright
Copyright
Subject
Physics; Condensed Matter Physics; Characterization and Evaluation of Materials; Magnetism, Magnetic Materials
ISSN
0022-2291
eISSN
1573-7357
DOI
10.1007/BF00681508
Publisher site
See Article on Publisher Site

Abstract

A microscopic theory is developed of finite-size effects in sintered metallic powders. In particular a model is constructed for the low frequency vibrational modes. It is argued that the bonding between atoms on adjacent surfaces of neighboring grains is extremely weak, 10−3–10−4 of its bulk value. Choosing the physical parameters accordingly, a constant density of “shaking box” states can be obtained. However, this behavior is not universal. A more complex density of states arises from slightly different choices of physical parameters and leads to a variety of temperature dependences for the sinter/liquid He Kapitza conductance at ultralow temperatures.

Journal

Journal of Low Temperature Physics – Springer Journals

Published: Nov 6, 2004

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